Keyless Entry Module: Description and Operation
REMOTE KEYLESS ENTRY MODULEThe Remote Keyless Entry module controls the Power Door Locks and the Vehicle Theft Security System (VTSS). It also wakes up the Instrument Cluster to turn ON the illuminated entry when it senses a signal from the RKE transmitter. The module communicates with other modules via the PCI bus circuit.
The RKE module monitors the Occupant Restraint Controller messages for the purpose of monitoring the deployment of the airbag. Upon receiving that message along with the verification that the ignition is ON and the vehicle speed is zero, it will provide the "enhanced accident response feature". This feature will cause the module to unlock all doors and the instrument cluster to turn the courtesy lamps ON.
The RKE module communicates with the Powertrain Control Module to receive vehicle speed information to activate the rolling door lock feature, receive the "okay to lock" message, to receive the vehicle information number and receive body style information. Two transmitters are supplied with the vehicle but a total of 4 can be programmed to the module. The horn chirp on vehicle lock command is customer programmable.
To limit the amount of battery drain during storage, the module has 3 modes of operation: ship mode, dealer storage mode and customer usage mode. To change from ship mode to dealer storage mode, the DRB III may be used or the ignition switch cycled up to 30 times. To transfer from dealer storage to customer mode, install the IOD fuse and cycle the ignition switch. To transfer back to dealer storage mode, the DRB III must be used, the IOD fuse removed, and the ignition switch cycled. Sometimes the instrument cluster doesn't transmit a message upon change of the IOD fuse. By cycling the ignition, this causes the cluster to transmit the message, thereby ensuring the RKE module has received the most recent IOD status.